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Rounding

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I've developed a novel propulsion system powered by loss of precision in unit conversion.
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125 days ago
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125 days ago
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sahand111
130 days ago
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cjheinz
132 days ago
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Geek!
Lythimus
132 days ago
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Did Randall waste his time making a spreadsheet for this or waste his time writing python code for this?
deezil
132 days ago
The answer is probably Yes.
jepler
132 days ago
I wrote a Python program to try to reproduce the above, but due to rounding issues(!!) it gets a longer answer than Randall's. His is correct, 15 yards/s is 7.5 fathoms/sec but my program ends up with an intermediate value of 7.49999mumble and rounds it to 7, adding an extra conversion to 15 m/s in between. https://gist.github.com/jepler/d1a2440469e2228ad50073a3a94c2917
jepler
132 days ago
actually, check that -- It may be the case that pint is right in some limited sense. wikipedia thinks that the US fathom is 1.828804 m until 2023; pint uses this definition, so it is correct to round down 15 yards to 7 fathoms. https://en.wikipedia.org/wiki/Fathom#International_fathom
jepler
132 days ago
Additionally, without adding furrther units, 45mph is as far as you can go.